CN105466093A - Virtual detection method and device for discharge pressure and back pressure of compressor - Google Patents
Virtual detection method and device for discharge pressure and back pressure of compressor Download PDFInfo
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- CN105466093A CN105466093A CN201510793975.9A CN201510793975A CN105466093A CN 105466093 A CN105466093 A CN 105466093A CN 201510793975 A CN201510793975 A CN 201510793975A CN 105466093 A CN105466093 A CN 105466093A
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
- F25B49/00—Arrangement or mounting of control or safety devices
- F25B49/02—Arrangement or mounting of control or safety devices for compression type machines, plants or systems
- F25B49/022—Compressor control arrangements
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F30/00—Computer-aided design [CAD]
- G06F30/30—Circuit design
- G06F30/36—Circuit design at the analogue level
- G06F30/367—Design verification, e.g. using simulation, simulation program with integrated circuit emphasis [SPICE], direct methods or relaxation methods
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
- F25B2700/00—Sensing or detecting of parameters; Sensors therefor
- F25B2700/19—Pressures
- F25B2700/193—Pressures of the compressor
- F25B2700/1931—Discharge pressures
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Abstract
The invention provides a virtual detection method and device for discharge pressure and back pressure of a compressor in a refrigerating system. The refrigerating system at least comprises an indoor heat exchanger, an outdoor heat exchanger and the compressor; the virtual detection method for the discharge pressure of the compressor comprises the steps that the saturated steam temperature in the outdoor heat exchanger is obtained; according to the saturated steam temperature in the outdoor heat exchanger, the saturated vapor pressure in the outdoor heat exchanger is determined; according to the pressure drop formula of the refrigerating system, the pressure drop value between the discharge pressure of the compressor and the saturated vapor pressure in the outdoor heat exchanger is calculated; and according to the pressure drop value and the saturated vapor pressure in the outdoor heat exchanger, the discharge pressure of the compressor is calculated. According to the technical scheme, the cost is low, detection can be carried out without cutting a pipe of the refrigerating system open, and the detection process is convenient and simple.
Description
Technical field
The present invention relates to refrigeration system technical field, the pressure at expulsion of compressor and the virtual detector of back pressure in the virtual detection method of the back pressure of compressor and a kind of refrigeration system in the virtual detection method of the pressure at expulsion of compressor, a kind of refrigeration system in a kind of refrigeration system.
Background technology
Pressure parameter in air-conditioning system running is extremely important for the situation analyzing whole system, is commonly used to judge degree of supercooling, the degree of superheat and air-conditioning fault diagnosis.In addition, pressure parameter analyzes Performance for Air Conditioning Systems indispensable parameter, due to pressure checking device costly, because which limit its application in air-conditioning system.Meanwhile, because pressure checking device often needs pipeline to cut rear signal piping pressure when detecting, this just brings the problems such as system instability and secondary refrigerant leakage.
Therefore, how technical problem urgently to be resolved hurrily can be become to the pressure at expulsion of air-conditioning system compressor in running and back pressure easily.
Summary of the invention
The present invention is intended at least to solve one of technical problem existed in prior art or correlation technique.
For this reason, one object of the present invention is to propose the pressure at expulsion of compressor in a kind of refrigeration system and the virtual detection scheme of back pressure, and not only cost is low, and pressure at expulsion and the back pressure of compressor can be detected simply, easily.
For achieving the above object, embodiment according to a first aspect of the invention, propose the virtual detection method of the pressure at expulsion of compressor in a kind of refrigeration system, described refrigeration system at least comprises indoor heat exchanger, outdoor heat exchanger and described compressor, described virtual detection method, comprising: obtain the saturated-steam temperature in described outdoor heat exchanger; According to the saturated-steam temperature in described outdoor heat exchanger, determine the saturated vapour pressure in described outdoor heat exchanger; According to the drop formula of refrigeration system, calculate the voltage drop value between the saturated vapour pressure in the pressure at expulsion of described compressor and described outdoor heat exchanger; The pressure at expulsion of described compressor is calculated according to the saturated vapour pressure in described voltage drop value and described outdoor heat exchanger.
The virtual detection method of the pressure at expulsion of compressor in refrigeration system according to an embodiment of the invention, by according to the saturated-steam temperature in outdoor heat exchanger, determine the saturated vapour pressure in outdoor heat exchanger, and the voltage drop value calculated according to drop formula between the saturated vapour pressure in the pressure at expulsion of compressor and outdoor heat exchanger, make it possible to according to the saturated vapour pressure in voltage drop value and outdoor heat exchanger, calculate the pressure at expulsion of compressor, compared to the scheme of being undertaken by pressure checking device in correlation technique detecting, detection scheme of the present invention not only cost is low, and detect again after pipeline is cut, testing process is convenient, simply.
According to one embodiment of present invention, the step obtaining the saturated-steam temperature in described outdoor heat exchanger specifically comprises: the thermo parameters method of simulating described outdoor heat exchanger when described refrigeration system is run under different operating mode, interval to determine the maximum probability residing for the saturated-steam temperature in described outdoor heat exchanger; Choose the predetermined quantity temperature spot in described maximum probability interval, calculate the mean value of a described predetermined quantity temperature spot, and using the mean value of a described predetermined quantity temperature spot as the saturated-steam temperature in described outdoor heat exchanger.
Particularly, can by Fluent software simulate refrigeration system run under different operating mode (be preferably typical condition) time, the thermo parameters method of outdoor heat exchanger, to find out maximum probability interval.
According to one embodiment of present invention, determine that the step of the saturated vapour pressure in described outdoor heat exchanger specifically comprises: according to the corresponding relation between saturated-steam temperature and saturated vapour pressure, determine the saturated vapour pressure in described outdoor heat exchanger.
According to one embodiment of present invention, also comprise: the pressure at expulsion being detected described compressor by detection means; The pressure at expulsion of the pressure at expulsion of the described compressor calculated with the described compressor detected by described detection means is compared, to obtain comparative result; Based on the drop formula of refrigeration system described in described comparative result correction.
The virtual detection method of the pressure at expulsion of compressor in refrigeration system according to an embodiment of the invention, by the pressure at expulsion of the compressor calculated and the pressure at expulsion detected by detection means are compared, and the drop formula of modified result refrigeration system based on the comparison, make it possible to revise drop formula according to the error between calculated value and actual value, and then ensure follow-up when again detecting, force value more accurately can be obtained.
According to one embodiment of present invention, the step calculating the pressure at expulsion of described compressor according to the saturated vapour pressure in described voltage drop value and described outdoor heat exchanger specifically comprises: calculate the saturated vapour pressure sum in described voltage drop value and described outdoor heat exchanger, using the pressure at expulsion as described compressor.
Embodiment according to a second aspect of the present invention, also proposed the virtual detection method of the back pressure of compressor in a kind of refrigeration system, described refrigeration system at least comprises indoor heat exchanger, outdoor heat exchanger and described compressor, described virtual detection method, comprising: obtain the saturated-steam temperature in described indoor heat exchanger; According to the saturated-steam temperature in described indoor heat exchanger, determine the saturated vapour pressure in described indoor heat exchanger; According to the drop formula of refrigeration system, calculate the voltage drop value between saturated vapour pressure in described indoor heat exchanger and the back pressure of described compressor; The back pressure of described compressor is calculated according to the saturated vapour pressure of described voltage drop value and described indoor heat exchanger.
The virtual detection method of the back pressure of compressor in refrigeration system according to an embodiment of the invention, by according to the saturated-steam temperature in indoor heat exchanger, determine the saturated vapour pressure in indoor heat exchanger, and calculate the voltage drop value between saturated vapour pressure in indoor heat exchanger and the back pressure of compressor according to drop formula, make it possible to according to the saturated vapour pressure in indoor heat exchanger and voltage drop value, calculate the back pressure of compressor, compared to the scheme of being undertaken by pressure checking device in correlation technique detecting, detection scheme of the present invention not only cost is low, and detect again after pipeline is cut, testing process is convenient, simply.
According to one embodiment of present invention, the saturated-steam temperature step obtained in described indoor heat exchanger specifically comprises: the thermo parameters method of simulating described indoor heat exchanger when described refrigeration system is run under different operating mode, interval to determine the maximum probability residing for the saturated-steam temperature in described indoor heat exchanger; Choose the predetermined quantity temperature spot in described maximum probability interval, calculate the mean value of a described predetermined quantity temperature spot, and using the mean value of a described predetermined quantity temperature spot as the saturated-steam temperature in described indoor heat exchanger.
Particularly, can by Fluent software simulate refrigeration system run under different operating mode (be preferably typical condition) time, the thermo parameters method of indoor heat exchanger, to find out maximum probability interval.
According to one embodiment of present invention, determine that the step of the saturated vapour pressure in described indoor heat exchanger specifically comprises: according to the corresponding relation between saturated-steam temperature and saturated vapour pressure, determine the saturated vapour pressure in described indoor heat exchanger.
According to one embodiment of present invention, also comprise: the back pressure being detected described compressor by detection means; The back pressure of the back pressure of the described compressor calculated with the described compressor detected by described detection means is compared, to obtain comparative result; Based on the drop formula of refrigeration system described in described comparative result correction.
The virtual detection method of the back pressure of compressor in refrigeration system according to an embodiment of the invention, by the back pressure of the compressor calculated and the back pressure detected by detection means are compared, and the drop formula of modified result refrigeration system based on the comparison, make it possible to revise drop formula according to the error between calculated value and actual value, and then ensure follow-up when again detecting, force value more accurately can be obtained.
According to one embodiment of present invention, the step calculating the back pressure of described compressor according to the saturated vapour pressure of described voltage drop value and described indoor heat exchanger specifically comprises:
Calculate the difference of saturated vapour pressure in described indoor heat exchanger and described voltage drop value, using the back pressure as described compressor.
Embodiment according to a third aspect of the present invention, also proposed the pressure at expulsion of compressor and the virtual detector of back pressure in a kind of refrigeration system, described refrigeration system at least comprises indoor heat exchanger, outdoor heat exchanger and described compressor, described virtual detector, comprise: acquiring unit, for obtaining the saturated-steam temperature in described indoor heat exchanger and the saturated-steam temperature in described outdoor heat exchanger; Determining unit, for according to the saturated-steam temperature in the saturated-steam temperature in described indoor heat exchanger and described outdoor heat exchanger, determines the saturated vapour pressure in described indoor heat exchanger and the saturated vapour pressure in described outdoor heat exchanger; First computing unit, for the drop formula according to refrigeration system, calculate the first voltage drop value between the saturated vapour pressure in the pressure at expulsion of described compressor and described outdoor heat exchanger respectively, and saturated vapour pressure in described indoor heat exchanger and the second voltage drop value between the back pressure of described compressor; Second computing unit, for calculating the pressure at expulsion of described compressor according to the saturated vapour pressure in described first voltage drop value and described outdoor heat exchanger, and calculate the back pressure of described compressor according to the saturated vapour pressure of described second voltage drop value and described indoor heat exchanger.
The pressure at expulsion of compressor and the virtual detector of back pressure in refrigeration system according to an embodiment of the invention, by according to the saturated-steam temperature in indoor heat exchanger and the saturated-steam temperature in outdoor heat exchanger, determine the saturated vapour pressure in indoor heat exchanger and the saturated vapour pressure in outdoor heat exchanger, and the first voltage drop value calculated according to drop formula between the saturated vapour pressure in the pressure at expulsion of compressor and outdoor heat exchanger, and saturated vapour pressure in indoor heat exchanger and the second voltage drop value between the back pressure of compressor, make it possible to according to the saturated vapour pressure in the first voltage drop value and outdoor heat exchanger, calculate the pressure at expulsion of compressor, and can according to the saturated vapour pressure in indoor heat exchanger and the second voltage drop value, calculate the back pressure of compressor, compared to the scheme of being undertaken by pressure checking device in correlation technique detecting, detection scheme of the present invention not only cost is low, and detect again after pipeline is cut, testing process is convenient, simply.
The pressure at expulsion of compressor and the virtual detector of back pressure in refrigeration system according to the abovementioned embodiments of the present invention, can also have following technical characteristic:
According to one embodiment of present invention, described acquiring unit comprises: processing unit, for simulating the thermo parameters method of described indoor heat exchanger and described outdoor heat exchanger when described refrigeration system is run under different operating mode, interval to determine the second maximum probability residing for the first maximum probability interval residing for the saturated-steam temperature in described indoor heat exchanger and the saturated-steam temperature in described outdoor heat exchanger; 3rd computing unit, for choosing the first predetermined quantity temperature spot in described first maximum probability interval, calculate the mean value of a described first predetermined quantity temperature spot, and using the mean value of a described first predetermined quantity temperature spot as the saturated-steam temperature in described indoor heat exchanger, and for choosing the second predetermined quantity temperature spot in described second maximum probability interval, calculate the mean value of a described second predetermined quantity temperature spot, and using the mean value of a described second predetermined quantity temperature spot as the saturated-steam temperature in described outdoor heat exchanger.
Particularly, can by Fluent software simulate refrigeration system run under different operating mode (be preferably typical condition) time, the thermo parameters method of indoor heat exchanger and outdoor heat exchanger, to find out, the first maximum probability is interval and the second maximum probability is interval.Wherein, the first predetermined quantity and the second predetermined quantity can be identical.
According to one embodiment of present invention, described determining unit specifically for: according to the corresponding relation between saturated-steam temperature and saturated vapour pressure, determine the saturated vapour pressure in described indoor heat exchanger and the saturated vapour pressure in described outdoor heat exchanger.
According to one embodiment of present invention, also comprise: detecting unit, for being detected the pressure at expulsion of described compressor and the back pressure of described compressor respectively by detection means; Comparing unit, pressure at expulsion and the back pressure of the described compressor detected by described detection means for the pressure at expulsion of described compressor that calculated by described second computing unit and back pressure and described detecting unit are compared, to obtain comparative result; Amending unit, for the drop formula based on refrigeration system described in described comparative result correction.
The pressure at expulsion of compressor and the virtual detector of back pressure in refrigeration system according to an embodiment of the invention, by the pressure at expulsion of the compressor calculated and back pressure and the pressure at expulsion detected by detection means and back pressure are compared, and the drop formula of modified result refrigeration system based on the comparison, make it possible to revise drop formula according to the error between calculated value and actual value, and then ensure follow-up when again detecting, force value more accurately can be obtained.
According to one embodiment of present invention, described second computing unit specifically for: calculate the saturated vapour pressure sum in described first voltage drop value and described outdoor heat exchanger, using the pressure at expulsion as described compressor, and for calculating the difference of saturated vapour pressure in described indoor heat exchanger and described second voltage drop value, using the back pressure as described compressor.
Embodiment according to a third aspect of the invention we, also proposed a kind of air-conditioner, comprising: the pressure at expulsion of compressor and the virtual detector of back pressure in the refrigeration system as described in above-mentioned any embodiment.
Additional aspect of the present invention and advantage will part provide in the following description, and part will become obvious from the following description, or be recognized by practice of the present invention.
Accompanying drawing explanation
Above-mentioned and/or additional aspect of the present invention and advantage will become obvious and easy understand from accompanying drawing below combining to the description of embodiment, wherein:
Fig. 1 shows the schematic flow diagram of the virtual detection method of the pressure at expulsion of compressor in refrigeration system according to an embodiment of the invention;
Fig. 2 shows the schematic flow diagram of the virtual detection method of the back pressure of compressor in refrigeration system according to an embodiment of the invention;
Fig. 3 shows the schematic flow diagram of the pressure at expulsion of compressor and the virtual detection method of back pressure in refrigeration system according to an embodiment of the invention;
Fig. 4 shows the schematic block diagram of the pressure at expulsion of compressor and the virtual detector of back pressure in refrigeration system according to an embodiment of the invention;
Fig. 5 shows the schematic block diagram of air-conditioner according to an embodiment of the invention.
Detailed description of the invention
In order to more clearly understand above-mentioned purpose of the present invention, feature and advantage, below in conjunction with the drawings and specific embodiments, the present invention is further described in detail.It should be noted that, when not conflicting, the feature in the embodiment of the application and embodiment can combine mutually.
Set forth a lot of detail in the following description so that fully understand the present invention; but; the present invention can also adopt other to be different from other modes described here and implement, and therefore, protection scope of the present invention is not by the restriction of following public specific embodiment.
Fig. 1 shows the schematic flow diagram of the virtual detection method of the pressure at expulsion of compressor in refrigeration system according to an embodiment of the invention.
Refrigeration system of the present invention at least comprises indoor heat exchanger, outdoor heat exchanger and compressor.As shown in Figure 1, the virtual detection method of the pressure at expulsion of compressor in refrigeration system according to an embodiment of the invention, comprising:
Step 102, obtains the saturated-steam temperature in described outdoor heat exchanger;
Step 104, according to the saturated-steam temperature in described outdoor heat exchanger, determines the saturated vapour pressure in described outdoor heat exchanger;
Step 106, according to the drop formula of refrigeration system, calculates the voltage drop value between the saturated vapour pressure in the pressure at expulsion of described compressor and described outdoor heat exchanger;
Step 108, calculates the pressure at expulsion of described compressor according to the saturated vapour pressure in described voltage drop value and described outdoor heat exchanger.
By according to the saturated-steam temperature in outdoor heat exchanger, determine the saturated vapour pressure in outdoor heat exchanger, and the voltage drop value calculated according to drop formula between the saturated vapour pressure in the pressure at expulsion of compressor and outdoor heat exchanger, make it possible to according to the saturated vapour pressure in voltage drop value and outdoor heat exchanger, calculate the pressure at expulsion of compressor, compared to the scheme of being undertaken by pressure checking device in correlation technique detecting, detection scheme of the present invention not only cost is low, and detect again after pipeline is cut, testing process is convenient, simple.
According to one embodiment of present invention, the step obtaining the saturated-steam temperature in described outdoor heat exchanger specifically comprises: the thermo parameters method of simulating described outdoor heat exchanger when described refrigeration system is run under different operating mode, interval to determine the maximum probability residing for the saturated-steam temperature in described outdoor heat exchanger; Choose the predetermined quantity temperature spot in described maximum probability interval, calculate the mean value of a described predetermined quantity temperature spot, and using the mean value of a described predetermined quantity temperature spot as the saturated-steam temperature in described outdoor heat exchanger.
Particularly, can by Fluent software simulate refrigeration system run under different operating mode (be preferably typical condition) time, the thermo parameters method of outdoor heat exchanger, to find out maximum probability interval.
According to one embodiment of present invention, determine that the step of the saturated vapour pressure in described outdoor heat exchanger specifically comprises: according to the corresponding relation between saturated-steam temperature and saturated vapour pressure, determine the saturated vapour pressure in described outdoor heat exchanger.
According to one embodiment of present invention, also comprise: the pressure at expulsion being detected described compressor by detection means; The pressure at expulsion of the pressure at expulsion of the described compressor calculated with the described compressor detected by described detection means is compared, to obtain comparative result; Based on the drop formula of refrigeration system described in described comparative result correction.
By the pressure at expulsion of the compressor calculated and the pressure at expulsion detected by detection means are compared, and the drop formula of modified result refrigeration system based on the comparison, make it possible to revise drop formula according to the error between calculated value and actual value, and then ensure follow-up when again detecting, force value more accurately can be obtained.
According to one embodiment of present invention, the step calculating the pressure at expulsion of described compressor according to the saturated vapour pressure in described voltage drop value and described outdoor heat exchanger specifically comprises: calculate the saturated vapour pressure sum in described voltage drop value and described outdoor heat exchanger, using the pressure at expulsion as described compressor.
Fig. 2 shows the schematic flow diagram of the virtual detection method of the back pressure of compressor in refrigeration system according to an embodiment of the invention.
Refrigeration system of the present invention at least comprises indoor heat exchanger, outdoor heat exchanger and compressor.As shown in Figure 2, the virtual detection method of the back pressure of compressor in refrigeration system according to an embodiment of the invention, comprising:
Step 202, obtains the saturated-steam temperature in described indoor heat exchanger;
Step 204, according to the saturated-steam temperature in described indoor heat exchanger, determines the saturated vapour pressure in described indoor heat exchanger;
Step 206, according to the drop formula of refrigeration system, calculates the voltage drop value between saturated vapour pressure in described indoor heat exchanger and the back pressure of described compressor;
Step 208, calculates the back pressure of described compressor according to the saturated vapour pressure of described voltage drop value and described indoor heat exchanger.
By according to the saturated-steam temperature in indoor heat exchanger, determine the saturated vapour pressure in indoor heat exchanger, and calculate the voltage drop value between saturated vapour pressure in indoor heat exchanger and the back pressure of compressor according to drop formula, make it possible to according to the saturated vapour pressure in indoor heat exchanger and voltage drop value, calculate the back pressure of compressor, compared to the scheme of being undertaken by pressure checking device in correlation technique detecting, detection scheme of the present invention not only cost is low, and detect again after pipeline is cut, testing process is convenient, simple.
According to one embodiment of present invention, the saturated-steam temperature step obtained in described indoor heat exchanger specifically comprises: the thermo parameters method of simulating described indoor heat exchanger when described refrigeration system is run under different operating mode, interval to determine the maximum probability residing for the saturated-steam temperature in described indoor heat exchanger; Choose the predetermined quantity temperature spot in described maximum probability interval, calculate the mean value of a described predetermined quantity temperature spot, and using the mean value of a described predetermined quantity temperature spot as the saturated-steam temperature in described indoor heat exchanger.
Particularly, can by Fluent software simulate refrigeration system run under different operating mode (be preferably typical condition) time, the thermo parameters method of indoor heat exchanger, to find out maximum probability interval.
According to one embodiment of present invention, determine that the step of the saturated vapour pressure in described indoor heat exchanger specifically comprises: according to the corresponding relation between saturated-steam temperature and saturated vapour pressure, determine the saturated vapour pressure in described indoor heat exchanger.
According to one embodiment of present invention, also comprise: the back pressure being detected described compressor by detection means; The back pressure of the back pressure of the described compressor calculated with the described compressor detected by described detection means is compared, to obtain comparative result; Based on the drop formula of refrigeration system described in described comparative result correction.
By the back pressure of the compressor calculated and the back pressure detected by detection means are compared, and the drop formula of modified result refrigeration system based on the comparison, make it possible to revise drop formula according to the error between calculated value and actual value, and then ensure follow-up when again detecting, force value more accurately can be obtained.
According to one embodiment of present invention, the step calculating the back pressure of described compressor according to the saturated vapour pressure of described voltage drop value and described indoor heat exchanger specifically comprises:
Calculate the difference of saturated vapour pressure in described indoor heat exchanger and described voltage drop value, using the back pressure as described compressor.
Fig. 3 shows the schematic flow diagram of the pressure at expulsion of compressor and the virtual detection method of back pressure in refrigeration system according to an embodiment of the invention.
Refrigeration system of the present invention at least comprises indoor heat exchanger, outdoor heat exchanger and compressor.As shown in Figure 3, the pressure at expulsion of compressor and the virtual detection method of back pressure in refrigeration system according to an embodiment of the invention, comprising:
Step 302, obtains the saturated-steam temperature in described indoor heat exchanger and the saturated-steam temperature in described outdoor heat exchanger;
Step 304, according to the saturated-steam temperature in the saturated-steam temperature in described indoor heat exchanger and described outdoor heat exchanger, determines the saturated vapour pressure in described indoor heat exchanger and the saturated vapour pressure in described outdoor heat exchanger;
Step 306, according to the drop formula of refrigeration system, calculate the first voltage drop value between the saturated vapour pressure in the pressure at expulsion of described compressor and described outdoor heat exchanger respectively, and saturated vapour pressure in described indoor heat exchanger and the second voltage drop value between the back pressure of described compressor;
Step 308, calculates the pressure at expulsion of described compressor according to the saturated vapour pressure in described first voltage drop value and described outdoor heat exchanger, and calculates the back pressure of described compressor according to the saturated vapour pressure of described second voltage drop value and described indoor heat exchanger.
By according to the saturated-steam temperature in indoor heat exchanger and the saturated-steam temperature in outdoor heat exchanger, determine the saturated vapour pressure in indoor heat exchanger and the saturated vapour pressure in outdoor heat exchanger, and the first voltage drop value calculated according to drop formula between the saturated vapour pressure in the pressure at expulsion of compressor and outdoor heat exchanger, and saturated vapour pressure in indoor heat exchanger and the second voltage drop value between the back pressure of compressor, make it possible to according to the saturated vapour pressure in the first voltage drop value and outdoor heat exchanger, calculate the pressure at expulsion of compressor, and can according to the saturated vapour pressure in indoor heat exchanger and the second voltage drop value, calculate the back pressure of compressor, compared to the scheme of being undertaken by pressure checking device in correlation technique detecting, detection scheme of the present invention not only cost is low, and detect again after pipeline is cut, testing process is convenient, simply.
Wherein, refrigeration system can be the refrigeration system in air-conditioner.
The pressure at expulsion of compressor and the virtual detection method of back pressure in refrigeration system according to the abovementioned embodiments of the present invention, can also have following technical characteristic:
According to one embodiment of present invention, the step obtaining the saturated-steam temperature in described indoor heat exchanger and the saturated-steam temperature in described outdoor heat exchanger specifically comprises:
Simulate the thermo parameters method of described indoor heat exchanger and described outdoor heat exchanger when described refrigeration system is run under different operating mode, interval to determine the second maximum probability residing for the first maximum probability interval residing for the saturated-steam temperature in described indoor heat exchanger and the saturated-steam temperature in described outdoor heat exchanger; Choose the first predetermined quantity temperature spot in described first maximum probability interval, calculate the mean value of a described first predetermined quantity temperature spot, and using the mean value of a described first predetermined quantity temperature spot as the saturated-steam temperature in described indoor heat exchanger; And the second predetermined quantity temperature spot chosen in described second maximum probability interval, calculate the mean value of a described second predetermined quantity temperature spot, and using the mean value of a described second predetermined quantity temperature spot as the saturated-steam temperature in described outdoor heat exchanger.
Particularly, can by Fluent software simulate refrigeration system run under different operating mode (be preferably typical condition) time, the thermo parameters method of indoor heat exchanger and outdoor heat exchanger, to find out, the first maximum probability is interval and the second maximum probability is interval.Wherein, the first predetermined quantity and the second predetermined quantity can be identical.
According to one embodiment of present invention, determine that the step of the saturated vapour pressure in described indoor heat exchanger and the saturated vapour pressure in described outdoor heat exchanger specifically comprises: according to the corresponding relation between saturated-steam temperature and saturated vapour pressure, determine the saturated vapour pressure in described indoor heat exchanger and the saturated vapour pressure in described outdoor heat exchanger.
According to one embodiment of present invention, also comprise: detect the pressure at expulsion of described compressor and the back pressure of described compressor respectively by detection means; The pressure at expulsion of the described compressor calculated and back pressure and the pressure at expulsion of described compressor detected by described detection means and back pressure are compared, to obtain comparative result; Based on the drop formula of refrigeration system described in described comparative result correction.
By the pressure at expulsion of the compressor calculated and back pressure and the pressure at expulsion detected by detection means and back pressure are compared, and the drop formula of modified result refrigeration system based on the comparison, make it possible to revise drop formula according to the error between calculated value and actual value, and then ensure follow-up when again detecting, force value more accurately can be obtained.
According to one embodiment of present invention, the pressure at expulsion of described compressor is calculated according to the saturated vapour pressure in described first voltage drop value and described outdoor heat exchanger, and specifically comprise according to the step that the saturated vapour pressure of described second voltage drop value and described indoor heat exchanger calculates the back pressure of described compressor: calculate the saturated vapour pressure sum in described first voltage drop value and described outdoor heat exchanger, using the pressure at expulsion as described compressor; And the difference of the saturated vapour pressure calculated in described indoor heat exchanger and described second voltage drop value, using the back pressure as described compressor.
Fig. 4 shows the schematic block diagram of the pressure at expulsion of compressor and the virtual detector of back pressure in refrigeration system according to an embodiment of the invention.
Refrigeration system of the present invention at least comprises indoor heat exchanger, outdoor heat exchanger and compressor.As shown in Figure 4, the pressure at expulsion of compressor and the virtual detector 400 of back pressure in refrigeration system according to an embodiment of the invention, comprising: acquiring unit 402, determining unit 404, first computing unit 406 and the second computing unit 408.
Wherein, acquiring unit 402, for obtaining the saturated-steam temperature in described indoor heat exchanger and the saturated-steam temperature in described outdoor heat exchanger; Determining unit 404, for according to the saturated-steam temperature in the saturated-steam temperature in described indoor heat exchanger and described outdoor heat exchanger, determines the saturated vapour pressure in described indoor heat exchanger and the saturated vapour pressure in described outdoor heat exchanger; First computing unit 406, for the drop formula according to refrigeration system, calculate the first voltage drop value between the saturated vapour pressure in the pressure at expulsion of described compressor and described outdoor heat exchanger respectively, and saturated vapour pressure in described indoor heat exchanger and the second voltage drop value between the back pressure of described compressor; Second computing unit 408, for calculating the pressure at expulsion of described compressor according to the saturated vapour pressure in described first voltage drop value and described outdoor heat exchanger, and calculate the back pressure of described compressor according to the saturated vapour pressure of described second voltage drop value and described indoor heat exchanger.
By according to the saturated-steam temperature in indoor heat exchanger and the saturated-steam temperature in outdoor heat exchanger, determine the saturated vapour pressure in indoor heat exchanger and the saturated vapour pressure in outdoor heat exchanger, and the first voltage drop value calculated according to drop formula between the saturated vapour pressure in the pressure at expulsion of compressor and outdoor heat exchanger, and saturated vapour pressure in indoor heat exchanger and the second voltage drop value between the back pressure of compressor, make it possible to according to the saturated vapour pressure in the first voltage drop value and outdoor heat exchanger, calculate the pressure at expulsion of compressor, and can according to the saturated vapour pressure in indoor heat exchanger and the second voltage drop value, calculate the back pressure of compressor, compared to the scheme of being undertaken by pressure checking device in correlation technique detecting, detection scheme of the present invention not only cost is low, and detect again after pipeline is cut, testing process is convenient, simply.
The pressure at expulsion of compressor and the virtual detector 400 of back pressure in refrigeration system according to the abovementioned embodiments of the present invention, can also have following technical characteristic:
According to one embodiment of present invention, described acquiring unit 402 comprises: processing unit 4022, for simulating the thermo parameters method of described indoor heat exchanger and described outdoor heat exchanger when described refrigeration system is run under different operating mode, interval to determine the second maximum probability residing for the first maximum probability interval residing for the saturated-steam temperature in described indoor heat exchanger and the saturated-steam temperature in described outdoor heat exchanger; 3rd computing unit 4024, for choosing the first predetermined quantity temperature spot in described first maximum probability interval, calculate the mean value of a described first predetermined quantity temperature spot, and using the mean value of a described first predetermined quantity temperature spot as the saturated-steam temperature in described indoor heat exchanger, and for choosing the second predetermined quantity temperature spot in described second maximum probability interval, calculate the mean value of a described second predetermined quantity temperature spot, and using the mean value of a described second predetermined quantity temperature spot as the saturated-steam temperature in described outdoor heat exchanger.
Particularly, can by Fluent software simulate refrigeration system run under different operating mode (be preferably typical condition) time, the thermo parameters method of indoor heat exchanger and outdoor heat exchanger, to find out, the first maximum probability is interval and the second maximum probability is interval.Wherein, the first predetermined quantity and the second predetermined quantity can be identical.
According to one embodiment of present invention, described determining unit 404 specifically for: according to the corresponding relation between saturated-steam temperature and saturated vapour pressure, determine the saturated vapour pressure in described indoor heat exchanger and the saturated vapour pressure in described outdoor heat exchanger.
According to one embodiment of present invention, also comprise: detecting unit 410, for being detected the pressure at expulsion of described compressor and the back pressure of described compressor respectively by detection means; Comparing unit 412, pressure at expulsion and the back pressure of the described compressor detected by described detection means for the pressure at expulsion of described compressor that calculated by described second computing unit 408 and back pressure and described detecting unit 410 are compared, to obtain comparative result; Amending unit 414, for the drop formula based on refrigeration system described in described comparative result correction.
By the pressure at expulsion of the compressor calculated and back pressure and the pressure at expulsion detected by detection means and back pressure are compared, and the drop formula of modified result refrigeration system based on the comparison, make it possible to revise drop formula according to the error between calculated value and actual value, and then ensure follow-up when again detecting, force value more accurately can be obtained.
According to one embodiment of present invention, described second computing unit 408 specifically for: calculate the saturated vapour pressure sum in described first voltage drop value and described outdoor heat exchanger, using the pressure at expulsion as described compressor, and for calculating the difference of saturated vapour pressure in described indoor heat exchanger and described second voltage drop value, using the back pressure as described compressor.
Fig. 5 shows the schematic block diagram of air-conditioner according to an embodiment of the invention.
As shown in Figure 5, air-conditioner 500 according to an embodiment of the invention, comprising: the pressure at expulsion of compressor and the virtual detector 400 of back pressure in refrigeration system as shown in Figure 4.
Below to detect pressure at expulsion and the back pressure of the compressor in the refrigeration system of air-conditioner, technical scheme of the present invention is described further.
In a preferred embodiment of the invention, mainly propose the virtual detection method to air-conditioner Compressor Discharge Pressure and back pressure in running, particularly, comprising:
1, utilize fluent software simulation to analyze air-conditioning system thermo parameters method of evaporimeter (i.e. indoor heat exchanger) and condenser (i.e. outdoor heat exchanger) in running under different typical condition, Binding experiment finds the maximum probability interval of saturated-steam temperature.
2, in maximum probability interval, multiple temperature sensor is distributed to obtain mean temperature, using as saturated-steam temperature, and then according to the corresponding relation between saturated-steam temperature and saturated vapour pressure, determine saturation pressure force P (Tse) of evaporimeter and saturation pressure force P (Tsc) of condenser.
Particularly, interval by the maximum probability repeatedly simulated and Experimental comparison finds saturation temperature point corresponding, at the N number of temperature sensor of this interval layout, regard the mean value of N number of temperature parameter as saturated-steam temperature, i.e. Ts=(Ts
1+ Ts
2+ ... ..+Ts
n)/N, according to the corresponding relation between saturation temperature and saturation pressure, i.e. Ps=P (Ts), can to obtain in condenser saturated vapour pressure P (Tse) in saturated vapour pressure P (Tsc) and evaporimeter.
3, Mathematical Modeling between temperature parameter and pressure parameter is set up to analyze the pressure drop between Compressor Discharge Pressure and condenser saturation pressure force, i.e. △ Pc, and the pressure drop between analytical calculation evaporimeter saturation pressure force and compressor return air pressure spot, i.e. △ Pe.
Particularly, when analyzing pressure drop, the drop formula according to tube runs:
wherein, K is coefficient, and m is refrigerant mass fluxes.
Under declared working condition, have equally:
To two formulas compare and can obtain above:
ΔP/ΔP
rated＝(m/m
rated)
2；
Owing to there is m=β m
rated, β is coefficient, the numerical values recited difference that different operating mode is corresponding.
Namely
wherein Δ P
ratedcan obtain according to compressor parameter of dispatching from the factory, be fixed value.
△ Pc under different operating mode and △ Pe can be obtained according to above pressure drop computational methods.
4, Compressor Discharge Pressure, i.e. Pd=P (Tsc)+△ Pc is calculated; And calculate the back pressure of compressor, i.e. Ps=P (Tse)-△ Pe, and detect income value with pressure tool and compare, revise the force value of virtual detection, specifically can revise the parameter value in drop formula.
Not only cost is low for the virtual pressure detection method that the present invention proposes, and detects logic advantages of simple.
More than be described with reference to the accompanying drawings technical scheme of the present invention, the present invention proposes the pressure at expulsion of compressor in a kind of refrigeration system and the virtual detection scheme of back pressure, not only cost is low, and pressure at expulsion and the back pressure of compressor can be detected simply, easily.
The foregoing is only the preferred embodiments of the present invention, be not limited to the present invention, for a person skilled in the art, the present invention can have various modifications and variations.Within the spirit and principles in the present invention all, any amendment done, equivalent replacement, improvement etc., all should be included within protection scope of the present invention.
Claims (15)
1. the virtual detection method of the pressure at expulsion of compressor in refrigeration system, it is characterized in that, described refrigeration system at least comprises indoor heat exchanger, outdoor heat exchanger and described compressor, and described virtual detection method, comprising:
Obtain the saturated-steam temperature in described outdoor heat exchanger;
According to the saturated-steam temperature in described outdoor heat exchanger, determine the saturated vapour pressure in described outdoor heat exchanger;
According to the drop formula of refrigeration system, calculate the voltage drop value between the saturated vapour pressure in the pressure at expulsion of described compressor and described outdoor heat exchanger;
The pressure at expulsion of described compressor is calculated according to the saturated vapour pressure in described voltage drop value and described outdoor heat exchanger.
2. the virtual detection method of the pressure at expulsion of compressor in refrigeration system according to claim 1, it is characterized in that, the step obtaining the saturated-steam temperature in described outdoor heat exchanger specifically comprises:
Simulate the thermo parameters method of described outdoor heat exchanger when described refrigeration system is run under different operating mode, interval to determine the maximum probability residing for the saturated-steam temperature in described outdoor heat exchanger;
Choose the predetermined quantity temperature spot in described maximum probability interval, calculate the mean value of a described predetermined quantity temperature spot, and using the mean value of a described predetermined quantity temperature spot as the saturated-steam temperature in described outdoor heat exchanger.
3. the virtual detection method of the pressure at expulsion of compressor in refrigeration system according to claim 1, is characterized in that, determine that the step of the saturated vapour pressure in described outdoor heat exchanger specifically comprises:
According to the corresponding relation between saturated-steam temperature and saturated vapour pressure, determine the saturated vapour pressure in described outdoor heat exchanger.
4. the virtual detection method of the pressure at expulsion of compressor in refrigeration system according to claim 1, is characterized in that, also comprise:
The pressure at expulsion of described compressor is detected by detection means;
The pressure at expulsion of the pressure at expulsion of the described compressor calculated with the described compressor detected by described detection means is compared, to obtain comparative result;
Based on the drop formula of refrigeration system described in described comparative result correction.
5. the virtual detection method of the pressure at expulsion of compressor in refrigeration system according to any one of claim 1 to 4, it is characterized in that, the step calculating the pressure at expulsion of described compressor according to the saturated vapour pressure in described voltage drop value and described outdoor heat exchanger specifically comprises:
Calculate the saturated vapour pressure sum in described voltage drop value and described outdoor heat exchanger, using the pressure at expulsion as described compressor.
6. the virtual detection method of the back pressure of compressor in refrigeration system, it is characterized in that, described refrigeration system at least comprises indoor heat exchanger, outdoor heat exchanger and described compressor, and described virtual detection method, comprising:
Obtain the saturated-steam temperature in described indoor heat exchanger;
According to the saturated-steam temperature in described indoor heat exchanger, determine the saturated vapour pressure in described indoor heat exchanger;
According to the drop formula of refrigeration system, calculate the voltage drop value between saturated vapour pressure in described indoor heat exchanger and the back pressure of described compressor;
The back pressure of described compressor is calculated according to the saturated vapour pressure of described voltage drop value and described indoor heat exchanger.
7. the virtual detection method of the back pressure of compressor in refrigeration system according to claim 6, it is characterized in that, the saturated-steam temperature step obtained in described indoor heat exchanger specifically comprises:
Simulate the thermo parameters method of described indoor heat exchanger when described refrigeration system is run under different operating mode, interval to determine the maximum probability residing for the saturated-steam temperature in described indoor heat exchanger;
Choose the predetermined quantity temperature spot in described maximum probability interval, calculate the mean value of a described predetermined quantity temperature spot, and using the mean value of a described predetermined quantity temperature spot as the saturated-steam temperature in described indoor heat exchanger.
8. the virtual detection method of the back pressure of compressor in refrigeration system according to claim 6, is characterized in that, determine that the step of the saturated vapour pressure in described indoor heat exchanger specifically comprises:
According to the corresponding relation between saturated-steam temperature and saturated vapour pressure, determine the saturated vapour pressure in described indoor heat exchanger.
9. the virtual detection method of the back pressure of compressor in refrigeration system according to claim 6, is characterized in that, also comprise:
The back pressure of described compressor is detected by detection means;
The back pressure of the back pressure of the described compressor calculated with the described compressor detected by described detection means is compared, to obtain comparative result;
Based on the drop formula of refrigeration system described in described comparative result correction.
10. the virtual detection method of the back pressure of compressor in the refrigeration system according to any one of claim 6 to 9, it is characterized in that, the step calculating the back pressure of described compressor according to the saturated vapour pressure of described voltage drop value and described indoor heat exchanger specifically comprises:
Calculate the difference of saturated vapour pressure in described indoor heat exchanger and described voltage drop value, using the back pressure as described compressor.
In 11. 1 kinds of refrigeration systems, the pressure at expulsion of compressor and the virtual detector of back pressure, is characterized in that, described refrigeration system at least comprises indoor heat exchanger, outdoor heat exchanger and described compressor, and described virtual detector, comprising:
Acquiring unit, for obtaining the saturated-steam temperature in described indoor heat exchanger and the saturated-steam temperature in described outdoor heat exchanger;
Determining unit, for according to the saturated-steam temperature in the saturated-steam temperature in described indoor heat exchanger and described outdoor heat exchanger, determines the saturated vapour pressure in described indoor heat exchanger and the saturated vapour pressure in described outdoor heat exchanger;
First computing unit, for the drop formula according to refrigeration system, calculate the first voltage drop value between the saturated vapour pressure in the pressure at expulsion of described compressor and described outdoor heat exchanger respectively, and saturated vapour pressure in described indoor heat exchanger and the second voltage drop value between the back pressure of described compressor;
Second computing unit, for calculating the pressure at expulsion of described compressor according to the saturated vapour pressure in described first voltage drop value and described outdoor heat exchanger, and calculate the back pressure of described compressor according to the saturated vapour pressure of described second voltage drop value and described indoor heat exchanger.
In 12. refrigeration systems according to claim 11, the pressure at expulsion of compressor and the virtual detector of back pressure, is characterized in that, described acquiring unit comprises:
Processing unit, for simulating the thermo parameters method of described indoor heat exchanger and described outdoor heat exchanger when described refrigeration system is run under different operating mode, interval to determine the second maximum probability residing for the first maximum probability interval residing for the saturated-steam temperature in described indoor heat exchanger and the saturated-steam temperature in described outdoor heat exchanger;
3rd computing unit, for choosing the first predetermined quantity temperature spot in described first maximum probability interval, calculate the mean value of a described first predetermined quantity temperature spot, and using the mean value of a described first predetermined quantity temperature spot as the saturated-steam temperature in described indoor heat exchanger, and for choosing the second predetermined quantity temperature spot in described second maximum probability interval, calculate the mean value of a described second predetermined quantity temperature spot, and using the mean value of a described second predetermined quantity temperature spot as the saturated-steam temperature in described outdoor heat exchanger.
In 13. refrigeration systems according to claim 11, the pressure at expulsion of compressor and the virtual detector of back pressure, is characterized in that, described determining unit specifically for:
According to the corresponding relation between saturated-steam temperature and saturated vapour pressure, determine the saturated vapour pressure in described indoor heat exchanger and the saturated vapour pressure in described outdoor heat exchanger.
The pressure at expulsion of compressor and the virtual detector of back pressure in 14. refrigeration systems according to claim 11, is characterized in that, also comprise:
Detecting unit, for detecting the pressure at expulsion of described compressor and the back pressure of described compressor respectively by detection means;
Comparing unit, pressure at expulsion and the back pressure of the described compressor detected by described detection means for the pressure at expulsion of described compressor that calculated by described second computing unit and back pressure and described detecting unit are compared, to obtain comparative result;
Amending unit, for the drop formula based on refrigeration system described in described comparative result correction.
15., according to claim 11 to the pressure at expulsion of compressor in the refrigeration system according to any one of 14 and the virtual detector of back pressure, is characterized in that, described second computing unit specifically for:
Calculate the saturated vapour pressure sum in described first voltage drop value and described outdoor heat exchanger, using the pressure at expulsion as described compressor, and for calculating the difference of saturated vapour pressure in described indoor heat exchanger and described second voltage drop value, using the back pressure as described compressor.
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